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Advisory record · GHSA-5vjj-2r48-q622

Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service

CVSS 6.9 MediumEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 13:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zaprosPyPI<0.14.00.14.0
Identifiers
GHSA-5vjj-2r48-q622 · CVE-2026-61541 · PYSEC-2026-4181
Weakness (CWE)
CWE-770
Tags
Published
23 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Zapros versions below 0.14.0 are vulnerable to a denial of service through unbounded Content-Encoding decompression. A malicious HTTP server can return a response with many chained content encodings, causing the client to build a deeply nested decompression chain that consumes excessive resources. Upgrade to Zapros 0.14.0, which limits responses to 5 Content-Encoding layers and raises an error for anything beyond that.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.